[php] Watermark nicht center sondern unten rechts

[quicksilver]

Hallo ich habe eine super Watermark Funktion gefunden die ein Bild nimmt und ein 2. Bild als Wasserzeichen zentriert mitten ins Bild einfügt. Ich möchte nun aber das Wasserzeichen nicht mitten im Bild sondern unten rechts mit Pixelangaben. Ich möchte also Fest in der Funktion angeben 100 px von rechts und 10 von unten und dort soll dann das Wasserzeichen stehen. kann mir da wer helfen?


Vielen Dank

<?php
class watermark{

	# given two images, return a blended watermarked image
	function create_watermark( $main_img_obj, $watermark_img_obj, $alpha_level = 100 ) {
		$alpha_level	/= 100;	# convert 0-100 (%) alpha to decimal
	
		# calculate our images dimensions
		$main_img_obj_w	= imagesx( $main_img_obj );
		$main_img_obj_h	= imagesy( $main_img_obj );
		$watermark_img_obj_w	= imagesx( $watermark_img_obj );
		$watermark_img_obj_h	= imagesy( $watermark_img_obj );
		
		# determine center position coordinates
		$main_img_obj_min_x	= floor( ( $main_img_obj_w / 2 ) - ( $watermark_img_obj_w / 2 ) );
		$main_img_obj_max_x	= ceil( ( $main_img_obj_w / 2 ) + ( $watermark_img_obj_w / 2 ) );
		$main_img_obj_min_y	= floor( ( $main_img_obj_h / 2 ) - ( $watermark_img_obj_h / 2 ) );
		$main_img_obj_max_y	= ceil( ( $main_img_obj_h / 2 ) + ( $watermark_img_obj_h / 2 ) ); 
		
		# create new image to hold merged changes
		$return_img	= imagecreatetruecolor( $main_img_obj_w, $main_img_obj_h );
	
		# walk through main image
		for( $y = 0; $y < $main_img_obj_h; $y++ ) {
			for( $x = 0; $x < $main_img_obj_w; $x++ ) {
				$return_color	= NULL;
				
				# determine the correct pixel location within our watermark
				$watermark_x	= $x - $main_img_obj_min_x;
				$watermark_y	= $y - $main_img_obj_min_y;
				
				# fetch color information for both of our images
				$main_rgb = imagecolorsforindex( $main_img_obj, imagecolorat( $main_img_obj, $x, $y ) );
				
				# if our watermark has a non-transparent value at this pixel intersection
				# and we're still within the bounds of the watermark image
				if (	$watermark_x >= 0 && $watermark_x < $watermark_img_obj_w &&
							$watermark_y >= 0 && $watermark_y < $watermark_img_obj_h ) {
					$watermark_rbg = imagecolorsforindex( $watermark_img_obj, imagecolorat( $watermark_img_obj, $watermark_x, $watermark_y ) );
					
					# using image alpha, and user specified alpha, calculate average
					$watermark_alpha	= round( ( ( 127 - $watermark_rbg['alpha'] ) / 127 ), 2 );
					$watermark_alpha	= $watermark_alpha * $alpha_level;
				
					# calculate the color 'average' between the two - taking into account the specified alpha level
					$avg_red		= $this->_get_ave_color( $main_rgb['red'],		$watermark_rbg['red'],		$watermark_alpha );
					$avg_green	= $this->_get_ave_color( $main_rgb['green'],	$watermark_rbg['green'],	$watermark_alpha );
					$avg_blue		= $this->_get_ave_color( $main_rgb['blue'],	$watermark_rbg['blue'],		$watermark_alpha );
					
					# calculate a color index value using the average RGB values we've determined
					$return_color	= $this->_get_image_color( $return_img, $avg_red, $avg_green, $avg_blue );
					
				# if we're not dealing with an average color here, then let's just copy over the main color
				} else {
					$return_color	= imagecolorat( $main_img_obj, $x, $y );
					
				} # END if watermark
		
				# draw the appropriate color onto the return image
				imagesetpixel( $return_img, $x, $y, $return_color );
		
			} # END for each X pixel
		} # END for each Y pixel
			
		# return the resulting, watermarked image for display
		return $return_img;
	
	} # END create_watermark()
	
	# average two colors given an alpha
	function _get_ave_color( $color_a, $color_b, $alpha_level ) {
		return round( ( ( $color_a * ( 1 - $alpha_level ) ) + ( $color_b	* $alpha_level ) ) );
	} # END _get_ave_color()
		
	# return closest pallette-color match for RGB values
	function _get_image_color($im, $r, $g, $b) {
		$c=imagecolorexact($im, $r, $g, $b);
		if ($c!=-1) return $c;
		$c=imagecolorallocate($im, $r, $g, $b);
		if ($c!=-1) return $c;
		return imagecolorclosest($im, $r, $g, $b);
	} # EBD _get_image_color()

} # END watermark API
?>

 

[Enigma]

Helfen kann man nur, wenn du ein Problem hast Sonst musst du fragen: Kann das bitte wer für mich programmieren?

Kleine Hilfe:

offset_x = main_img_max_x - 100 - watermark_max_x;
offset_y = main_img_max_y - 10 - watermark_max_y;
for(x=0;x<watermark_max_x;x++) {
    for(y=0;y<watermark_max_y;y++) {
        imagesetpixel(main_img, offset_x + x, offset_y+y, imagecolorat(watermark, x,y));
    }
}